javabeans

问题 I heared rules of JavaBean, in which first and main rule is , for every JavaBean class explicitly programmer should provide public default constructor . Please can anyone explain why do we need to provide default constructor for JavaBean UPDATE : Please explain clearly, why jvm will not provide default constructor for JavaBeans and how jvm reacts on providing default constructor 回答1: I heared rules of JavaBean, in which first and main rule is , for every JavaBean class explicitly programmer

问题 I heared rules of JavaBean, in which first and main rule is , for every JavaBean class explicitly programmer should provide public default constructor . Please can anyone explain why do we need to provide default constructor for JavaBean UPDATE : Please explain clearly, why jvm will not provide default constructor for JavaBeans and how jvm reacts on providing default constructor 回答1: I heared rules of JavaBean, in which first and main rule is , for every JavaBean class explicitly programmer

来源： https://stackoverflow.com/questions/3095146/what-are-the-best-spring-converter-strategies-in-the-case-of-a-string-to-convert

来源： https://stackoverflow.com/questions/64259736/how-do-i-unit-test-spring-security-preauthorize-custom-expression

来源： https://stackoverflow.com/questions/64259736/how-do-i-unit-test-spring-security-preauthorize-custom-expression

来源： https://stackoverflow.com/questions/63549480/hibernate-method-validation-not-always-working

来源： https://stackoverflow.com/questions/63549480/hibernate-method-validation-not-always-working

问题 I am a junior Java developer and I am reading the spring documentation from spring.io. I read that every bean that gets registered in the *.xml file that spring uses to resolve dependencies is declared using <bean> </bean> tags. My question is: In which data structure are the beans hold after the xml file is read and the beans are instantiated(created)? Thank you 回答1: Although you should not be worried much about the internal structures if you are just beginning to learn Spring but for the

问题 I'm newly started reading about Java Beans and I had a question which was exactly same as this Topic's question. So I repeat The question: in definition it is said " java bean encapsulates many objects into one object(Bean). " 1.What does "many objects" here mean? and 2.How they are encapsulated into one object by java beans? Edit: From Java Beans Wikipedia: in computing based on the Java Platform, JavaBeans are classes that encapsulate many objects into a single object (the bean). Edit2: all

问题 I am reading What components are MVC in JSF MVC framework? In the big architectural picture, your own JSF code is the V : M - Business domain/Service layer (e.g. EJB/JPA/DAO) V - Your JSF code C - FacesServlet In the developer picture, the architectural V is in turn dividable as below: M - Entity V - Facelets/JSP page C - Managed bean On the upper case, the JavaBean is a model. But on the lower case, the Managed bean becomes a controller? They are not the same thing? What are the difference?